The pericardial cavity contains 25 c.c. of creamy, yellow, purulent, fluid; the epicardium is dull, covered in a few places by a small amount of fibrin and below it are ecchymoses. The peritoneal cavity contains 100 c.c. of thick, yellow pus; the peritoneal surfaces are injected and between the liver and diaphragm is fibrin. Bacteriologic examination shows the presence of S. hemolyticus in pure culture from the blood of the heart, the lower lobe of the left lung, pericardium and peritoneum. The right main bronchus contains the same microorganism, B. influenzæ and a few staphylococci. General serositis has been caused by hemolytic streptococci which in one instance have entered the pleura from a subpleural abscess, and in the other from the suppurating interstitial tissue of the lung. In one of these cases the patient entered the hospital with symptoms suggestive of acute peritonitis. Bronchiectasis Acute dilatation of the bronchi is a common result of the bronchitis of influenza, and its frequent occurrence is an index of the severity of the changes in the bronchial wall. In some instances the smaller bronchi in well-localized areas are uniformly dilated; in other instances, large cavities, several centimeters in diameter, are formed and all transitions between the two extremes occur. The occurrence of bronchiectasis following influenza is mentioned by Leichtenstern[86]. He states that evidence of bronchiectasis can persist for weeks or months and nevertheless end with complete restitution of the lungs to normal. Lord[87] has described instances of bronchiectasis occurring in association with infection by B. influenzæ and Boggs[88] has recorded similar observations. We have had abundant opportunity to observe early stages in the production of bronchiectasis and to study the much discussed pathogenesis of the condition. The following figures show the predilection of bronchiectasis for the left lung and for the lower lobes: Bronchiectasis occurred 30 times in the left lung alone, 9 times in the right lung alone and 13 times in both lungs, the total being 52. Among 30 instances in which the lesion occurred only in the left lung, in 24 it was limited to the lower lobe, and in 15 of these 24 instances to the base of the lower lobe. Among 9 instances in which dilatation of bronchi occurred only in the right lung, it was limited to the lower lobe in 4 instances and to the base of the lower lobe in 2 of these 4 instances. When the lesion is limited to the base of the lower lobes small bronchi with no recognizable cartilage in their wall are dilated to a diameter of from 3 to 6 cm. and are distended with thick mucopurulent fluid. The tenacious character of the bronchial contents and the action of gravity doubtless have a part in the production of the dilatation. In several instances dilatation of the bronchi was limited to the basal parts of both upper and lower lobes.